Isolated Coordination Polyhedron Confinement in ABPO:Mn (A = Ba/Sr; B = Mg/Zn).

Many research efforts have focused on designing new inorganic phosphors to meet different application requirements. The structure-photoluminescence relationship between activator ions and the matrix lattice plays an irreparable role in designing target phosphors. Herein, a series of ABPO:Mn (A = Ba/Sr; B = Mg/Zn) phosphors are prepared for a detailed study on the relationship between the luminescence performance and spatial structure and symmetry of the doping site of Mn. Due to the weak interaction between nearest B-B pairs, [BO] is defined as an isolated coordination polyhedron whose structure and symmetry directly influence the photoluminescence of Mn. The emission wavelength of Mn is ∼620 nm when it occupies the triangular bipyramid [MgO] in BaMgPO. When Mn occupies the quadrangular pyramid-typed [MgO] or [ZnO] in SrMgPO, SrZnPO, and BaZnPO, the emission wavelengths peak at ∼670 nm. We propose a conception of isolated coordination polyhedral confinement to clarify the luminescence performance of Mn in the fivefold coordination configuration with different geometries, which has great theoretical research significance for designing inorganic phosphors.